package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.HashMap;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
    //微信授权登录url
    public static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties wxProperties;

    @Autowired
    private UserMapper userMapper;
    //微信登陆
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        log.info("微信登陆：{}", userLoginDTO);
        //调用微信接口服务，获取当前微信用户的openid
       String openid = getOpenid(userLoginDTO.getCode());

        //判断openid是否为空，如果为空则说明登录失败
         if (openid == null){
             throw new RuntimeException(MessageConstant.LOGIN_FAILED);
         }
        //根据openid判断当前微信用户是否为新用户
       User user = userMapper.getByOpenid(openid);

        //如果是新用户则自动完成注册
        if (user == null){
            user = User.builder()
                    .openid(openid)
                    .build();
            userMapper.insert(user);
        }

        //返回用户对象
        return user;
    }

    private String getOpenid(String code) {
        HashMap <String, String> map = new HashMap <>();
        map.put("appid", wxProperties.getAppid());
        map.put("secret", wxProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        String json=HttpClientUtil.doGet(WX_LOGIN_URL, map);

        JSONObject jsonObject = JSONObject.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
